Photosynthetic plasticity of endosymbionts in larger benthic coral reef Foraminifera
作者： Maren Ziegler , Sven Uthicke
DOI: 10.1016/J.JEMBE.2011.07.009
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摘要: Abstract Larger benthic Foraminifera (LBF) are ecologically important coral reef protists that harbour a large diversity of symbionts from at least four algal phyla. In this study the photosynthetic plasticity different endosymbiontic algae found within LBF was investigated using pulse amplitude modulated (PAM) fluorometry. Maximum quantum efficiencies photosystem II (F v /F m ) obtained foraminiferal specimens directly after field collection indicated several pronounced differences between species containing endosymbionts phyla and, to lesser extent, also varied contain same algae. Foraminiferal retaining functional chloroplasts and rhodophyte-bearing had distinctly lower F , than with dinoflagellates, diatoms or chlorophytes. A laboratory experiment conducted over 48 h exposing occurring in high- (photophilic), medium- low-light (sciaphilic) environments three manipulated light levels. Photophysiological responses were monitored by measuring regular intervals rapid curves (RLCs) end experiment. This demonstrated oscillation maximum according light-dark cycle. Changes shape RLCs (e.g., higher α E k under low conditions) allows acclimatise rapidly (
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